1 | /**
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2 | * Wait until the test condition is true or a timeout occurs. Useful for waiting
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3 | * on a server response or for a ui change (fadeIn, etc.) to occur.
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4 | *
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5 | * @param testFx javascript condition that evaluates to a boolean,
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6 | * it can be passed in as a string (e.g.: "1 == 1" or "$('#bar').is(':visible')" or
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7 | * as a callback function.
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8 | * @param onReady what to do when testFx condition is fulfilled,
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9 | * it can be passed in as a string (e.g.: "1 == 1" or "$('#bar').is(':visible')" or
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10 | * as a callback function.
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11 | * @param timeOutMillis the max amount of time to wait. If not specified, 3 sec is used.
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12 | */
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13 | function waitFor(testFx, onReady, timeOutMillis) {
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14 | var maxtimeOutMillis = timeOutMillis ? timeOutMillis : 3000, //< Default Max Timout is 3s
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15 | start = new Date().getTime(),
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16 | condition = false,
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17 | interval = setInterval(function() {
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18 | if ( (new Date().getTime() - start < maxtimeOutMillis) && !condition ) {
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19 | // If not time-out yet and condition not yet fulfilled
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20 | condition = (typeof(testFx) === "string" ? eval(testFx) : testFx()); //< defensive code
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21 | } else {
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22 | if(!condition) {
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23 | // If condition still not fulfilled (timeout but condition is 'false')
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24 | console.log("'waitFor()' timeout");
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25 | phantom.exit(1);
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26 | } else {
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27 | // Condition fulfilled (timeout and/or condition is 'true')
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28 | console.log("'waitFor()' finished in " + (new Date().getTime() - start) + "ms.");
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29 | typeof(onReady) === "string" ? eval(onReady) : onReady(); //< Do what it's supposed to do once the condition is fulfilled
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30 | clearInterval(interval); //< Stop this interval
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31 | }
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32 | }
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33 | }, 250); //< repeat check every 250ms
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34 | };
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35 |
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36 |
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37 | var page = require('webpage').create();
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38 |
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39 | // Open Twitter on 'sencha' profile and, onPageLoad, do...
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40 | page.open("http://twitter.com/#!/sencha", function (status) {
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41 | // Check for page load success
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42 | if (status !== "success") {
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43 | console.log("Unable to access network");
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44 | } else {
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45 | // Wait for 'signin-dropdown' to be visible
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46 | waitFor(function() {
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47 | // Check in the page if a specific element is now visible
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48 | return page.evaluate(function() {
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49 | return $("#signin-dropdown").is(":visible");
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50 | });
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51 | }, function() {
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52 | console.log("The sign-in dialog should be visible now.");
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53 | phantom.exit();
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54 | });
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55 | }
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56 | });
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57 |
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